Do It Yourself Large Brush Handle Grip

Use foam hot water pipe insulation to wrap around brush handles. Tape it in place for a firm fit. If the hole diameter or the overall size is too big/bulky, cut a wedge out of the foam. Then, snug it more firmly in place before taping. The foam creates a non-slip grip that can be held with less force. The enlarged size lets you hold the handle more comfortably with less finger bend.